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    Coursera
    1. Probability Theory, Statistics and Exploratory Data Analysis
    2. Week 5
    3. Sample variance
    PreviousNext
      • Completed
        Video: LectureIntroduction to the 5th week
        . Duration: 5 minutes5 min
      • Completed
        Video: LectureBasic statistical model
        . Duration: 11 minutes11 min
      • Completed
        Video: LectureVariable types in statistics. Conversion of categorical variables to numeric
        . Duration: 12 minutes12 min
      • Completed
        Quiz: Variable types practice
        4 questions
      • Completed
        Video: LectureMeasures of central tendency. Average, median and mode
        . Duration: 10 minutes10 min
      • Completed
        Quiz: Measures of central tendency
        4 questions
      • Completed
        Video: LectureMeasures of statistical dispersion. Sample variance, quartiles and interquartile range
        . Duration: 15 minutes15 min
      • Completed
        Quiz: Sample variance
        2 questions
      • Completed
        Video: LectureDistribution visualization. Histograms and bar plots
        . Duration: 10 minutes10 min
      • Completed
        Quiz: Data visualizations
        3 questions
      • Completed
        Video: LectureDescriptive statistics of sample vs population
        . Duration: 11 minutes11 min
      • Completed
        Video: LectureDescriptive statistics in Pandas
        . Duration: 11 minutes11 min
      • Completed
        Video: LectureBasic visualizations of statistical data in Python
        . Duration: 7 minutes7 min
      • Completed
        Video: LectureConverting columns in dataframes
        . Duration: 12 minutes12 min
      • Completed
        Video: LectureData summarization and descriprive statistics. Highlights
        . Duration: 2 minutes2 min
    QuizQuiz • 10 min10 minutes

    Sample variance

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    Sample variance
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    Sample variance

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    1.
    Question 1

    Find unbiased sample variance var+(𝑥)var_+(𝑥)var+​(x) of this sample: 𝑥=(9,3,8,5,9)𝑥 = (9, 3, 8, 5, 9)x=(9,3,8,5,9)

    1 / 1 point
    7.2
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    2.
    Question 2

    What’s the right conclusion about variances v1v_1v1​ and v2v_2v2​ of these samples:

    • 𝑥1=(2,8,3,5,2,5,2,6,3,5,2,1)
    • 𝑥2=(7,13,8,10,7,10,7,11,8,10,7,6)
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